// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import Foundation

internal struct BenchmarkFilter {
    let negate: Bool
    let underlying: NSRegularExpression?

    init(_ regularExpression: String?, negate: Bool) throws {
        self.negate = negate
        if regularExpression != nil {
            self.underlying = try NSRegularExpression(
                pattern: regularExpression!,
                options: [.caseInsensitive, .anchorsMatchLines])
        } else {
            self.underlying = nil
        }
    }

    func matches(suiteName: String, benchmarkName: String) -> Bool {
        if underlying == nil {
            return true
        } else {
            let str = "\(suiteName).\(benchmarkName)"
            let range = NSRange(location: 0, length: str.utf16.count)
            var result = underlying!.firstMatch(in: str, range: range) != nil
            result = negate ? !result : result
            return result
        }
    }
}
